作者：黄正均1,2, 张栋1,2, 刘钰1,2, 吴冠德3, 李青翔3, 陈倩男1
作者单位：1. 北京科技大学土木与资源工程学院，北京 100083;
2. 北京科技大学 城市地下空间工程北京市重点实验室，北京 100083;
3. 清华大学建筑设计研究院有限公司，北京 100084
关键词：薄壁纸筒;四点弯曲;弯曲强度;弯曲模量;断裂形态
摘要：
薄壁纸筒（纸管）作为一种新型环保建筑材料，常用于临时建筑、雕塑等纸材建筑的结构构件，除抗压缩、抗拉伸等力学性能外，抗弯曲性能也是其应用时在结构设计和后期使用中需重点关注的基础性能指标。结合纸筒材料具有的层压结构、刚度低等特性，采用改进的四点弯曲法，对纸筒试样开展弯曲试验，有效获取纸筒样品的弯曲强度和弯曲模量等指标，得出其弯曲强度高于一般水泥砂浆、混凝土等的抗折强度，表明其具有较优异的抗弯曲性能，可作为临时建筑等中小型建筑的建筑材料。此外，分析发现纸筒（纸管）在弯曲荷载作用下的断裂形态具有前后各异的分层破坏特征。
Experimental research on the bending performance of thin wallpaper tube
HUANG Zhengjun1,2, ZHANG Dong1,2, LIU Yu1,2, WU Guande3, LI Qingxiang3, CHEN Qiannan1
1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing Key Laboratory of Urban Underground Space Engineering, USTB, Beijing 100083, China;
3. Architectural Design and Research Institute of Tsinghua University Co., Ltd., Beijing 100084, China
Abstract: Thin wallpaper tube (paper tube) as a new type of environmentally friendly building material is often used in temporary buildings, sculptures and other paper building structural components. In addition to its mechanical properties such as compression and tensile resistance, bending resistance is also the basic performance index that needs to be paid attention to in structural design and later use. Combined with the laminated structure and low rigidity of the paper tube material, the improved four-point bending method is used to carry out the bending test on the paper tube sample. The flexural strength and flexural modulus of the paper tube samples are effectively obtained, and the flexural strength is higher than the flexural strength of ordinary cement mortar, concrete, etc., indicating that it has excellent flexural performance and can be used as building materials for small buildings such as temporary buildings. In addition, the analysis found that the fracture morphology of the paper tube (paper tube) under the bending load has the characteristics of different layered failure before and after.
Keywords: thin wallpaper tube;four-point bending;bending strength;bending modulus;fracture shape
2021, 47(8):137-143 收稿日期: 2021-03-07;收到修改稿日期: 2021-05-15
基金项目: 国际科技创新合作重点专项（2018YFE0101100）；国家自然科学基金项目（U2034206）
作者简介: 黄正均(1985-),男,重庆市人,高级工程师,博士,主要从事岩土力学及建筑材料等试验的研究
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